title: Projected fringe profilometry using a liquid-crystal spatial light modulator to extend the depth measuring range.
abstract: An approach using a liquid-crystal spatial light modulator (LC-SLM) to enlarge the depth measuring range of the projected fringe profilometry is presented. This approach is especially applicable to detect dynamic objects with micro-scale sizes. Compared with a typical 2D image system, the LC-SLM provides a better performance for a 3D shape sensing system. The main advantages include (1) a much higher allowance to increase in the depth measuring range, (2) easiness to compensate perspective distortion and geometric distortion, (3) very high accuracy (in the micron-range) and (4) only one phase measurement needed for operation.
authors.affiliation: Department of Material Science and Optoelectronic Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan. wxs156@mail.nsysu.edu.tw
authors.forename: Wei-Hung
authors.initials: WH
authors.lastname: Su
authors.forename: Chun-Hsiang
authors.initials: CH
authors.lastname: Hsu
authors.forename: Wei-Chia
authors.initials: WC
authors.lastname: Su
authors.forename: Jung-Ping
authors.initials: JP
authors.lastname: Liu